There are a bunch of places offering a free federal tax return, but only a few restricted offers that allow you to file your state tax return for free. So TurboTax is probably banking on the fact that the free federal return will get customers in the door and it will be too inconvenient to file a paper return for your State taxes (or qualify for one of the free deals). TurboTax is also making some bold guarantees about the program as well…

